initHadron/impactParameter [ Global module-variables ]

smaller 0: Impact parameter will be chosen
randomly in the interval [0;abs(impactParameter)]
(see subroutine setGeometry).
It is recommended to take very large negative value of impactParameter
in order to have good automatic random choice, e.g. impactParameter=-100.

The user has to provide the namelist 'hadron', which contains
the impact parameter, lab. energy, id, charge and antiparticle-
parameters of the hadron.
If the input impact parameter is negative, then
the actual impact parameter is chosen by Monte-Carlo between
0 and abs(input impact parameter).